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[Solved] Generation of designer file failed

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ComboBox

This is a migrated thread and some comments may be shown as answers.

Lenny_shp asked on 23 Feb 2010, 03:30 PM

VS2008 SP1 RadAjax 2009.3.1210.35
Generation of designer file failed: Telerik.Web.UI.RadComboBoxItemCollection must have items of type 'Telerik.Web.UI.RadComboBoxItem'. 'telerik:RadComboBoxItem' is of type 'Telerik.Web.UI.RadComboBoxItem'.

I deleted the designer file then right clicked on ascx 'Conver to Web Application' to have it recreate the designer file and I got the above error. I checked all the comboboxes in the ascx and they all have at least 1 comboItem.

Prior to deleting the designer file I didn't have a problem with the combobox, except that I added a RadGrid and it didn't get added to the designer file automatically.

    
                                <MyApp:MyRadComboBox Required="true" runat="server" ID="cboMJA" XmlTag="MainCategory" Filter="Contains" Skin="Simple"  
        
                                        AutoPostBack="true" AllowCustomText="false" NoWrap="true" Width="280px"> 
        
                                    <Items> 
        
                                        <telerik:RadComboBoxItem Text="" /> 
        
                                    </Items>                
        
                                    <ExpandAnimation  Type="None" /> 
        
                                    <CollapseAnimation Type="None" />       
        
                                </bessemer:MyRadComboBox>

1 Answer, 1 is accepted

answered on 01 Mar 2010, 12:22 PM

Hello Lenny_shp,

This error most usually happens if you change the Design.dll while there is a page opened in Design-time.

Please try closing all pages using the designer and re-add the Design dll to your project. If this does not help, please try restarting Visual Studio.

Sincerely yours,
Simon
the Telerik team

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